Pericycle in roots is never thick and sclerenchymatous because

Options

A. it does not act as mechanical tissue in roots
B. it gives rise to root hairs
C. it is a place of origin of lateral roots
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Pericycle**: The pericycle is a layer of cells located just inside the endodermis in the roots of plants. It plays a crucial role in the formation of lateral roots.

2. **Composition of Pericycle**: The pericycle is primarily composed of parenchymatous tissue, which is characterized by its thin-walled cells. This tissue is generally living and can be involved in various functions, including storage and transport.

3. **Role in Lateral Root Formation**: During secondary growth, the pericycle is responsible for giving rise to lateral roots. This process is essential for the plant's ability to expand its root system and access more nutrients and water.

4. **Sclerenchyma Characteristics**: Sclerenchyma is a type of plant tissue that is composed of dead cells and provides structural support. It is characterized by thick, lignified cell walls, making it rigid and strong.

5. **Why Pericycle is Not Sclerenchymatous**: The pericycle does not become thick and sclerenchymatous because:
- It needs to remain flexible to facilitate the growth and emergence of lateral roots.
- If the pericycle were thickened and composed of sclerenchyma, it would hinder the formation of lateral roots, which is contrary to its function.

6. **Comparison with Other Tissues**: While some tissues in plants, such as the cortex or the vascular tissues, may have sclerenchymatous characteristics for support, the pericycle's role in root development necessitates it to remain thin and parenchymatous.

7. **Conclusion**: Therefore, the pericycle in roots is never thick and sclerenchymatous because it is essential for the formation of lateral roots, which requires a flexible and thin-walled structure.